…Can someone please explain to me what I need to do to earn his trust back and
have him trust me that I am sorry and that I know I hurt him and I will never do
it again? I need to show him daily that I am sorry and make up for hurting him
and lying to him for years.

You’re defiled (Jer. 32:34). He is not required to have sex with you again. God
promotes everything good which leads to life and healthy living (Jn 10:10). He
does not ask his children to take on venereal diseases (1 Co 7:15).

Yes, the OT Mosaic code did require both partners in an adulterous relationship
be stoned to death. However, that does not answer the question asked: is there
no redemption for Brittney and/or her marriage?

Our culture does not obey God's law (we'll be judged for it). She can be
forgiven (Lk 17:3).

Jesus did not have the adulteress stoned...

And you thought that meant anarchy for the rest of us?
Ro
13:4. When did God nail do not murder, do not commit adultery to the
cross? The law is for the lawless (1 Ti 1:9).

[Deut 24:4 Put the adulterer to death, defilement of the land] That verse is
about divorce and remarriage, not adultery.

There's no such thing as divorce. Don't ask questions for which you don't want
the answer (Mt 19:11).

...a self-appointed authority and arbiter of God and His word instead of a
submitted obedient of God and His word?

Drink up. Fornicate
on (Re 22:11).

I will ask the question again and by grace with patience and kindness provide an
opportunity for you to answer...

So
are you (Pr 26:5).
[You don't think the first adulterous couple is beautiful? Ex 20:14, Heb 13:4]
Only because the question asked is not being answered.

You're
free to clarify your undying support for marriage at any time (Eph 4:14).

Shoulda read some more of my posts before making that comment.

No
thanks (Eph 4:14).

Marriage is one man, one woman in covenant (Gen. 2:18-24) for life (Rom. 7:2,
3). Some honor marriage. Others do not (Heb 13:4). All will give an account (1
Pe 4:5).
...[Y]ou will have to give account for making false accusations against a
brother in Christ...